People wait outside the Metropolitan Cathedral for the arrival of Pope Francis. (Photo by Mario Tama/Getty Images)

Pope Francis greets the crowd from his popemobile in downtown Rio de Janeiro. Pope Francis touched down in Rio de Janeiro on Monday, starting his first foreign trip as pontiff and a weeklong series of events expected to attract more than a million people to a gathering of young faithful in Brazil, home to the world's largest Roman Catholic population. (Photo by Ueslei Marcelino/Reuters)

A pilgrim cries next to her husband as they pray inside the Basilica of Our Lady of Aparecida, Brazil's patron saint, in the city of Aparecida Do Norte, 103 miles east of Sao Paulo on July 23, the day before Pope Francis's visit to the basilica. (Photo by Nacho Doce/Reuters)

Nuns who rarely leave the Nossa Senhora dos Anjos monastery wait in line in the rain to attend Pope Francis' visit to the Hospital de Sao Francisco de Assis (Hospital of Saint Francis of Assisi) on July 24 in Rio de Janeiro. (Photo by Mario Tama/Getty Images)

Residents of the Varginha slum wait under umbrellas, while police guard the street, as they wait for Pope Francis to visit the slum on July 25, 2013. (Photo by Pilar Olivares/Associated Press)

Pope Francis confesses young faithful participating in the XXVIII World Youth Day in Rio de Janeiro on July 26, 2013. (Photo by L'Osservatore Romano)

Nuns celebrate and take pictures as Pope Francis arrives to give the Angelus noon prayer in Rio de Janeiro on July 26, 2013. (Photo by Luca Zennaro/Associated Press)

Nuns and sunbathers wait for the arrival of Pope Francis on Copacabana beach in Rio de Janeiro, July 26, 2013. Pope Francis on Thursday issued the first social manifesto of his young pontificate, telling slum dwellers in Brazil that the world's rich must do much more to wipe out vast inequalities between the haves and the have-nots. (Photo by Ricardo Moraes/Reuters)

Nuns wade in the Copacabana beach water, in Rio de Janeiro, Brazil, Sunday, July 28, 2013. Pope Francis wrapped up a historic trip to his home continent Sunday with the World Youth Day's closing Mass on the Copacabana beachfront. He was leaving for Rome Sunday night. (Photo by Nicolas Tanner/AP Photo)

A nun takes pictures of bathers before the arrival of Pope Francis on Copacabana beach in Rio de Janeiro, July 26, 2013. Pope Francis on Thursday issued the first social manifesto of his young pontificate, telling slum dwellers in Brazil that the world's rich must do much more to wipe out vast inequalities between the haves and the have-nots. (Photo by Ricardo Moraes/Reuters)

Two Polish nuns look at people bathing as hundreds of thousands of young Catholic pilgrims attend the World Youth Day gathering at Copacabana beach in Rio de Janeiro. (Photo by Yasuyoshi Chiba/AFP Photo)

Pope Francis celebrates mass at the Sao Sebastiao Cathedral in Rio de Janeiro on July 27, 2013. The pope told Catholic clergy on Saturday to leave their comfort zones and smug surroundings and reach out to serve the poor and needy. (Photo by Luca Zennaro/Reuters)

Pope Francis meets with children in the Municipal Theater. (Photo by Carlo Wrede/Agencia O Dia/Reuters)

Pope Francis wears an indigenous headdress given to him by Ubirai Matos from the Pataxo tribe after the pontiff spoke at Rio's Municipal Theater. (Photo by L'Osservatore Romano)

A nun reacts as the tide comes in on Copacabana beach. (Photo by Victor R. Caivano/Associated Press)

A protestor wearing a gay pride flag kneels in front of a line of National Guard officers preventing demonstrators from approaching the site of a vigil with Pope Francis during World Youth Day celebrations on Copacabana beach. Demonstrators were protesting for women's rights and gay rights, as well as against government corruption and the World Cup. (Photo by Silvia Izquierdo/Associated Press)

Pilgrims sleep along Avenida Atlantica, next to Copacabana beach, during the night vigil. (Photo by Nicolas Tanner/Associated Press)